Happy here with stiff-legged deadlifting 160kgx10 for three sets, it's a great hamstring mass builder. Notice my strict form - I keep my back flat, very slight bend in knee, controlled lowering of the bar to stretch the hamstring as well as pausing at the bottom of the lift to force the hamstrings to work even harder.
My routine went as follows:-
BARBELL DEADLIFT - 190kgx8x2
No bouncing from the floor, pulling as fast as I could while remaining in control. I do this exercise on hamstring day, as I see it as primarily a hamstrings and hip exercise rather than back
BARBELL STIFF LEGGED DEADLIFT - 160kgx10x3
Form must be perfect on this lift otherwise you could hurt your lower back. Done properly it targets the upper portion of hamstring
PRONE LEG CURL - 5 sets
Really focus on squeezing the hamstrings rather than just moving the weight
SEATED LEG CURL - 3 sets
Try pausing at the top of each rep to really force the hamstrings to work harder
LEGS PRESS WITH FEET PLACE HIGH - 3 sets of 20
Push through your heels to use hamstrings rather than quads. Great finishing exercise to get a great pump
Sam